Nomenclature types for substituted

Complete protonation of dinitrogen results in hydrazine, which can bind throngh either one (11) or both (bridging) N atoms, but high oxidation state metals are readily rednced. The nomenclature for substituted hydrazines is very confusing (63-67). Three types of hgands are available with a formal double bond between the two N atoms (1) diazenido (6), obtained from diazonium compounds (ArN2+),... 

Since the lUPAC nomenclature system relies totally on the pivotal concept of the parent structure to which, in a second sphere, substituents are assigned, it appeared advisable to maintain this division also for the chapters of this book. Thus, we begin with the exposition of the nomenclature rules for parent structures and, in the second chapter, proceed with the discussion of the different types of nomenclature for substituted systems, radicals, and ions in the third chapter specific classes of functional compounds are addressed, followed, in the forth chapter, by the treatment of metal organyls and, in the fifth, of carbohydrates. The concluding sixth chapter takes up once again the construction of the final names of complex compounds including isotopic modifiers and stereochemical descriptors. 

This naming method is used only for a limited number of compound classes which are listed in Table 9 in descending order of priority. In contrast to substitutive nomenclature, parent systems are named here in the guise of their radicals , i. e. substituent groups, to which are added, separated by a space, the anionized names of the compound class in question. Some examples may illustrate the principles of this nomenclature type ... 

It is possible to regard radicofunctional nomenclature, in which the functional class narrie of a compound (c.g. alcohol, ketone, etc.) is cited after the names of the attached radicals, as involving an additive procedure (example 146). This type of nomenclature is gradually falling out of use in favor of the substitutive equivalent [for 146 the substitutive name would be l-(3-pyridyl)propan-l-one]. 

The numbering of the carbon atoms is, according to the nomenclature rules used by the Chemical Abstracts7, 8, consistent with the numbering for fatty acids. The compounds are typed depending upon the substitution pattern of the cyclopentane ring and classified by the degree of unsaturation in the side chains see Scheme 1. 

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